NSDecimal has toll-free bridging with NSDecimalNumber so you can still do as casting when talking to an Objective-C API.
> On Nov 11, 2016, at 2:56 PM, Chris Anderson via swift-users > <swift-users@swift.org> wrote: > > Sure thing. Yeah, ideally the bridging would be fixed, but at the least, > correcting the documentation will be a good start. Will file, thanks. > > Best, > Chris Anderson > >> On Nov 11, 2016, at 5:55 PM, Tony Parker <anthony.par...@apple.com >> <mailto:anthony.par...@apple.com>> wrote: >> >> Hi Chris, >> >> Can you file a radar or JIRA for us on this? It looks like something should >> be fixed in the documentation at least, or perhaps in the bridging. >> >> - Tony >> >>> On Nov 11, 2016, at 1:46 PM, Chris Anderson via swift-users >>> <swift-users@swift.org <mailto:swift-users@swift.org>> wrote: >>> >>> I'm having problems with the type conversion between a Swift `Decimal` and >>> an Objective C `NSDecimalNumber`. >>> >>> If I have the Swift class: >>> >>> @objc class Exam: NSObject { >>> var grade: Decimal = 90.0 >>> } >>> >>> And try to use that Swift class in Objective C, >>> >>> Exam *exam = [[Exam alloc] init]; >>> NSDecimalNumber *result = [[NSDecimalNumber zero] >>> decimalNumberByAdding:grade.value]; >>> >>> I get the error: >>> >>> Sending 'NSDecimal' to parameter of incompatible type 'NSDecimalNumber * >>> _Nonnull' >>> >>> as it seems like `grade` is being treated as an `NSDecimal` not an >>> `NSDecimalNumber`. This seems incorrect as per >>> https://developer.apple.com/reference/foundation/nsdecimalnumber >>> <https://developer.apple.com/reference/foundation/nsdecimalnumber> it says >>> >>> "The Swift overlay to the Foundation framework provides the Decimal >>> structure, which bridges to the NSDecimalNumber class. The Decimal value >>> type offers the same functionality as the NSDecimalNumber reference type, >>> and the two can be used interchangeably in Swift code that interacts with >>> Objective-C APIs. This behavior is similar to how Swift bridges standard >>> string, numeric, and collection types to their corresponding Foundation >>> classes." >>> >>> So I'm not sure if 1) I'm doing something wrong. 2) there's an error in the >>> documentation or 3) this is a Swift bug. Number 1 on that list is >>> definitely the most likely, but I wanted to see what I’m missing here. >>> >>> I don't want to explicitly make the values in my Swift class >>> `NSDecimalNumber` because then I cannot do simple arithmetic operations >>> such as `+` without doing the whole ugly `decimalNumberByAdding` dance. >>> >>> Thanks for the help! >>> >>> Best, >>> Chris Anderson >>> _______________________________________________ >>> swift-users mailing list >>> swift-users@swift.org <mailto:swift-users@swift.org> >>> https://lists.swift.org/mailman/listinfo/swift-users >>> <https://lists.swift.org/mailman/listinfo/swift-users> >> > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users
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